Jump to content

Recommended Posts

I am in the process of setting up a dust extraction system for my workshop. The vital bit is a cyclone, which discharges sawdust into a bin, hooked up to a vacuum cleaner which collects the dust. It's a pretty conventional setup. There are los of videos on u tube.

However, I bought a vacuum cleaner online. It's rated noise level was stated to be 48 dB. This seemed excellent, as most vacs are in the 70 to 80 range, and on a logarithmic scale, that's quite a difference.

However, as I should have known, if something seems to good to be true, it probably is.

When I fired it up, I didn't need sophisticated measuring devices to tell me it was way over 48.

So I am stuck with it and will try to incorporate it as originally intended and have started to look at sound attenuation.

The plan is to place the cyclone, vac and sawdust bin in a cabinet underneath a bench.

I am dealing with airborne noise as well as direct vibration.

Having done some research, it's not clear to me if it's mass, in the form of a sturdy cabinet, or special sound- deadening foam- as used in recording studios, that I need, or both.

If any members have experience of this, I would appreciate your advice.

Canute and thibaultron like this

Share this post


Link to post
Share on other sites
Posted (edited)

Put it outside mounted on a post or stand secured to the ground, not your shop, place it where you will have minimum bends on the suctions side, build a shelter around it with easy access for upkeep and cleaning. No point in taking up space inside, wiring with an inside switch should be easy and the hole for the suction pipe should not be a problem either, just use foam or rubber to seal, don't want hard contact with the structure. Enjoy your quiet and cleaner work space.

Edited by jud

Share this post


Link to post
Share on other sites
7 hours ago, jud said:

Put it outside mounted on a post or stand secured to the ground, not your shop, place it where you will have minimum bends on the suctions side, build a shelter around it with easy access for upkeep and cleaning. No point in taking up space inside, wiring with an inside switch should be easy and the hole for the suction pipe should not be a problem either, just use foam or rubber to seal, don't want hard contact with the structure. Enjoy your quiet and cleaner work space.

Thanks jud, unfortunately I can't put it outside. I'm in a French town with 600 thick stone walls  and fierce planning regs. As I said, I'm still not clear if it's mass or absorption or both that I need need to be really effective. If I put it in a brick box for example, as generators sometimes are, I'm sure that's more effective than a ply one, but recording studios use special profile foam, not just polystyrene.The answer is probably both. On, on

mtaylor, Canute, thibaultron and 1 other like this

Share this post


Link to post
Share on other sites

Have seen walls made soundproof by double studding. Each side had it's own support 2 X 4 studding sitting on the same 2 X 6 sill. The studs were evenly spaced but alternating sides, so a sound absorbing curtain could be woven between them, when in place each side was finishing to match the rest of the structure, just 2" thicker than the 2 X 4 walls. Might be able to duplicate the effects of such a wall, using double boxes separated by, a curtain. The discharge air could be muffled by a series of furnace filters or filter material stacked inside a large tube made to fit your space and allowing a muffled  depressurization your vacuum container inner box. Like most things, different ways to get the job done. Good Luck.

Share this post


Link to post
Share on other sites

As part of researching noise levels in my workshop, I came across noise- measuring apps online.Some of these are free. While they are not really the equivalent of professional noise- level meters, they are perfectly adequate for my purposes. My iPad now becomes my meter.

thibaultron, jud and Canute like this

Share this post


Link to post
Share on other sites
Posted (edited)

Is a there closet in your workshop?  Insulate it well and put the equipment in there. Otherwise you'll have to build an enclosure. 

Edited by mtaylor

Share this post


Link to post
Share on other sites
Posted (edited)

Thanks Mark. As I said earlier, it's not clear to me if it is mass, in the form of a sturdy container, ( brick, plasterboard etc.), or absorption in the form of special foam , ( or some combination of both,) that will be most effective to reduce both airborne sound and direct vibration.  Putting this kit in a foam- lined box of some sort will obviously lower noise levels, but as this will run for long periods, I'm keen to make it as efficient as possible. Seems to be a lot of conflicting info out there. Research continues.

Edited by Williamo
Canute and thibaultron like this

Share this post


Link to post
Share on other sites

Absorptive material inside the box will be the key to sound deadening.   One thing you might do is go here:  https://sawmillcreek.org/forum.php.   I use the laser forums a lot for info.   The users are very helpful.  You may have become a "user" and register.  But a search on "dust extractor"  should give you lots of hits.  

Canute and thibaultron like this

Share this post


Link to post
Share on other sites

Maybe it would just be better to bite the bullet and get a quieter vacuum!

By the time you finish the suggested installation you'll probably spend about as much as a new machine would cost...never mind the work. And would the installation even work as well?

 

Then you might sell the one you have now

 

Chazz

thibaultron, Canute and mtaylor like this

Share this post


Link to post
Share on other sites

I used an old Sears 16 gal shop vac for years - It was really loud - had to use

sound suppressing head phones with it.  When the motor started arching, I

retired it to the dump.  Following discussions here I bought a Festool Midi.

Since I use a cyclone trap - the capacity of the unit is not important and the

smaller foot print was an advantage.  It is quiet enough, and pulls enough air,

but it turns itself off after a short run time.  A total waste of $600.

Looking around, I found a Rigid 14 gal at Home Depot for $100 that is about as 

quiet.  I no longer need the head phones.  It stays on just fine.  The only occasional

problem = I live in a condo and I think at least one neighbor has a garage door remote

that uses the same frequency as my on/off remote for the vac.  I have to make sure to

unplug it when I am done.

Canute, mtaylor and thibaultron like this

Share this post


Link to post
Share on other sites

Jaager,

 

If it works both ways, you could have a lot of fun opening their garage door with your shop vac.....

 

;)

Canute, thibaultron and jud like this

Share this post


Link to post
Share on other sites

A side swipe lighting strike burned out the circuit board on my garage door opener and I have

never placed it.  I manually open the door and unlike most, I do keep my car in the garage -

I live on The Bay - Little Creek harbor actually - the salt water could maybe rust my car. I

do not mind the exercise.  So I don't know if the frequencies are the same - and an ironic factor

is that my car has the ability to produce the activation signal.

 

I was hoping someone knew why the Festool will not run continuously.  It acts as though the

overheat protection control is set at too low a temp.

It is not the RF switch.  If it because of the cyclone trap ( the Wood Craft salesman said

that Festool nixed a custom cyclone trap for their machines) then it really is an unacceptable machine. 

Pointless to test that since I will never not have the cyclone trap in-line.  The clogged filter and

quickly full bag with a vac only system = too much hassle.

thibaultron, Canute and mtaylor like this

Share this post


Link to post
Share on other sites
On 6/13/2018 at 5:58 PM, Chazz said:

Maybe it would just be better to bite the bullet and get a quieter vacuum!

By the time you finish the suggested installation you'll probably spend about as much as a new machine would cost...never mind the work. And would the installation even work as well?

 

Then you might sell the one you have now

 

Chazz

I did think of that and may do it but in any case the vac noise needs to be reduced.My current household vac is 80 dB. Too loud to run for long periods, especially while other kit is running.

Canute, mtaylor and thibaultron like this

Share this post


Link to post
Share on other sites
On 6/13/2018 at 8:07 AM, mtaylor said:

Absorptive material inside the box will be the key to sound deadening.   One thing you might do is go here:  https://sawmillcreek.org/forum.php.   I use the laser forums a lot for info.   The users are very helpful.  You may have become a "user" and register.  But a search on "dust extractor"  should give you lots of hits.  

Thanks for the Sawmill Creek connection. Very helpful.

As I said , reading noise reduction fora tells me the whole noise issue seems poorly understood, esp the relationship between mass and absorption. Research continues.

Canute, thibaultron and mtaylor like this

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

About us

Modelshipworld - Advancing Ship Modeling through Research

SSL Secured

Your security is important for us so this Website is SSL-Secured

NRG Mailing Address

Nautical Research Guild
237 South Lincoln Street
Westmont IL, 60559-1917

About the NRG

If you enjoy building ship models that are historically accurate as well as beautiful, then The Nautical Research Guild (NRG) is just right for you.

The Guild is a non-profit educational organization whose mission is to provide support to our members in their efforts to raise the quality of their model shipcraft.

The Nautical Research Guild puts on ship modeling seminars, yearly conferences, and juried competitions. We publish books on ship modeling techniques as well as our world-renowned quarterly magazine, The Nautical Research Journal, whose pages are full of articles by master ship modelers who show you how they build those exquisite details on their models, and by maritime historians who show you what details to build.

Our Emblem

Modelshipworld - Advancing Ship Modeling through Research
×